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Power feeding system for telephone terminal in lan

  • US 20040081316A1
  • Filed: 12/04/2003
  • Published: 04/29/2004
  • Est. Priority Date: 08/19/1998
  • Status: Active Grant
First Claim
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1. In a LAN having terminals connected to each other via cables extending from a line concentrator, each of said cables including therein a signal line for delivering data signals for mutual communication between the terminals and said terminals including at least one telephone terminal, a power feeding system comprising:

  • a power feed line included in each of said cables;

    a power feed section for feeding power to said at least one telephone terminal via the corresponding power feed line;

    power feed control switching sections each for establishing or disabling communication between said power feed section and the corresponding power feed line;

    a current monitor section for detecting whether a value of current flowing in each of said power feed lines when each of said power feed lines is connected to said power feed section is within a preset current value range which represents a state where the telephone terminal is connected to the cable including therein the corresponding power feed line; and

    a control section for controlling said power feed control switching sections to connect the corresponding power feed lines to said power feed section in sequence, and for controlling each of said power feed control switching sections to stop feeding the power via the corresponding power feed line when said current monitor section detects that the value of the current flowing in the corresponding power feed line is outside said preset current value range, and to continue feeding the power via the corresponding power feed line when said current monitor section detects that the value of the current flowing in the corresponding power feed line is within said preset current value range.

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